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Commit 2e046b94 authored by Paul Mundt's avatar Paul Mundt
Browse files

sh: Provide cpu_idle_wait() to fix up cpuidle/SMP build. 



Crib the x86 cpu_idle_wait() implementation and shove it in with the
idle code, subsequently enabling ARCH_HAS_CPU_IDLE_WAIT.

Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent d888a4c7

arch/sh/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -151,6 +151,9 @@ config ARCH_NO_VIRT_TO_BUS 
config ARCH_HAS_DEFAULT_IDLE

	def_bool y



config ARCH_HAS_CPU_IDLE_WAIT

	def_bool y



config IO_TRAPPED

	bool

arch/sh/include/asm/system.h

+1 −0
Original line number Diff line number Diff line
@@ -154,6 +154,7 @@ extern struct dentry *sh_debugfs_root; 


void per_cpu_trap_init(void);

void default_idle(void);

void cpu_idle_wait(void);



asmlinkage void break_point_trap(void);

arch/sh/kernel/idle.c

+22 −1
Original line number Diff line number Diff line 
/*

 * The idle loop for all SuperH platforms.

 *

 *  Copyright (C) 2002 - 2008  Paul Mundt

 *  Copyright (C) 2002 - 2009  Paul Mundt

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive
@@ -15,6 +15,7 @@ 
#include <linux/preempt.h>

#include <linux/thread_info.h>

#include <linux/irqflags.h>

#include <linux/smp.h>

#include <asm/pgalloc.h>

#include <asm/system.h>

#include <asm/atomic.h>
@@ -79,3 +80,23 @@ void cpu_idle(void) 
		check_pgt_cache();

	}

}



static void do_nothing(void *unused)

{

}



/*

 * cpu_idle_wait - Used to ensure that all the CPUs discard old value of

 * pm_idle and update to new pm_idle value. Required while changing pm_idle

 * handler on SMP systems.

 *

 * Caller must have changed pm_idle to the new value before the call. Old

 * pm_idle value will not be used by any CPU after the return of this function.

 */

void cpu_idle_wait(void)

{

	smp_mb();

	/* kick all the CPUs so that they exit out of pm_idle */

	smp_call_function(do_nothing, NULL, 1);

}

EXPORT_SYMBOL_GPL(cpu_idle_wait);